Magnetic reproducing apparatus and magnetic reproducing method

Abstract

There are provided a magnetic reproducing apparatus and a magnetic reproducing method, which are suitable for use in reproducing a magnetic tape by using, for example, a magnetoresistive element. A signal input from a data input 1 undergoes processing suitable for magnetic recording in a recording signal processing circuit 2, and is supplied to a predetermined precoder 3. The signal from the precoder 3 is recorded by a recording head 5 on a recording medium 6 such as a magnetic tape through a recording amplifier 4. The signal read from the recording medium 6 by the reproducing head 7 is supplied to a reproduction equalizer amplifier 8 to be amplified and equalized. The equalized signal is supplied to a circuit 10 having a channel characteristic of, for example, a Partial Response Class 4 (PR4) through an A/D converter 9. The output signal from the circuit 10 is supplied to a PR4 decoder circuit 11 to detect the signal. Further, the signal from the decoder circuit 11 is sent to a reproduction signal processing circuit 12. Then, the signal is output to a data output 13 after executing demodulation, restoration to the original form from the packetized state of the signal, error correction and the like. Accordingly, the magnetoresistive element conventionally used for reproducing a hard disk and the like may be applied to reproduction of a magnetic tape.

1 . A magnetic reproducing apparatus in which reproduction is performed according to a non-tracking method characterized in that: 
 a detecting method in which low-frequency components of a reproduction signal are not used is employed as reproduction means.    
     
     
         2 . A magnetic reproducing apparatus according to  claim 1 , wherein 
 said detecting method is of a Partial Response Class 4.    
     
     
         3 . A magnetic reproducing apparatus according to  claim 1 , wherein 
 said detecting method is of an E-Partial Response Class 4.    
     
     
         4 . A magnetic reproducing apparatus according to  claim 1 , wherein 
 said detecting method is of an EE-Partial Response Class 4.    
     
     
         5 . A magnetic reproducing apparatus according to  claim 1 , wherein 
 said reproduction signal is reproduced using a magnetoresistive element.    
     
     
         6 . A magnetic reproducing apparatus according to  claim 1 , wherein 
 said reproduction signal is reproduced using a magnetoresistive element and    electric current is supplied to said magnetoresistive element with a low-frequency signal.    
     
     
         7 . A magnetic reproducing method in which reproduction is performed according to a non-tracking method characterized in that: 
 a detecting method in which low-frequency components of a reproduction signal are not used is employed as reproduction means.    
     
     
         8 . A magnetic reproducing method according to  claim 7 , wherein 
 said detecting method is of a Partial Response Class 4.    
     
     
         9 . A magnetic reproducing method according to  claim 7 , wherein 
 said detecting method is of an E-Partial Response Class 4.    
     
     
         10 . A magnetic reproducing method according to  claim 7 , wherein 
 said detecting method is of an EE-Partial Response Class 4.    
     
     
         11 . A magnetic reproducing method according to  claim 7 , wherein 
 said reproduction signal is reproduced using a magnetoresistive element.    
     
     
         12 . A magnetic reproducing method according to  claim 7 , wherein 
 said reproduction signal is reproduced using a magnetoresistive element and    electric current is supplied to said magnetoresistive element with a low-frequency signal.